Phase Offset Combined Signal for Low Latency Wireless Control
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE technology, face challenges in achieving lower latency and efficient resource utilization as the demand for mobile broadband access increases, necessitating improvements in transmission time intervals and resource allocation.
Innovation Solution
The method involves generating a combined waveform with a reference signal and control data signal that are phase offset from each other, transmitted on a single resource block within a transmission time interval (TTI) that is less than a subframe, allowing for lower latency communications and reduced signaling resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If control data and reference signals are transmitted separately in legacy LTE subframes, then resource allocation is straightforward, but transmission latency increases and resource utilization efficiency decreases
Solution Approach 1:
The patent combines control data and reference signals into a single phase-encoded waveform transmitted on one resource block. The reference signal and control data are merged by applying different phase offsets to the same base sequence, allowing both signals to coexist in the same time-frequency resource without requiring separate resource allocations.
Solution Approach 2:
The patent uses phase encoding as a parameter change to distinguish between reference signals and control data. By applying different phase offsets (e.g., 0, π/2, π, 3π/2) to the same base sequence, the system can differentiate between signal types without changing the underlying resource structure, thus reducing latency while maintaining signal distinguishability.
2Reliability
If multiple resource blocks are allocated for control data transmission, then signal reliability improves, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent merges multiple functions (reference signal transmission and control data transmission) into a single resource block. This consolidation maintains transmission reliability through phase diversity while significantly improving resource utilization by eliminating the need for multiple separate resource allocations that would otherwise be required.
3Difficulty of detecting and measuring
If separate transmissions are used for reference signals and control data, then signal detection is simpler, but transmission time and resource consumption increase
Solution Approach 1:
The patent applies phase encoding as a discriminative parameter to distinguish reference signals from control data within the same waveform. The receiver can detect and separate these signals by detecting their respective phase offsets, maintaining detection simplicity while reducing transmission time through consolidated resource usage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables lower latency wireless communications by transmitting a combined signal that includes both reference and control data in a single TTI, facilitating faster data exchange and improved resource utilization, thereby enhancing the efficiency of wireless communication systems.
Implementation Method 1
The reference signal and the control data signal are phase offset from one another in the waveform
Data Source
AI summary
Various aspects described herein relate to wireless communications, including generating a waveform including a combined reference signal and control data signal, the reference signal and the control data signal being phase offset from one another in the waveform, and transmitting the waveform on one resource block in a transmission time interval having a duration that is less than a subframe.